Chuck.



(I. J. LETZING.

CHUCK,

. APPLICATION FlLED JULYZ, 1911- Patented Apr. 16, 1918.

rips Y rang its inst;

I51 21'. LJETZING, (3F BQSTQN, MASSAQHUSETTS.

CHUCK I indication filed 3111; 2, 1

the county of Sufiollr of li iassschusetts, a citizen of d States, invented a new and mprovement in Chucks, of which the is a specification.

wed, and my invention relates specia i" to the means for attaching a gear or t the piste against which it J5 4 i .c i v r. prererred or usual iorm my clinch a gear, which is attached thereto, .1168. s an edge view of this term of a rear view of another embodi 331 t elf-my invention;

5 being a face view thereof, the gear ,7 indicated in dotted lines, and

6 h section on the line 3-4) of and 8 are and front views of form or invention.

section on line 92-9 of Fig. *2.

- a View A. is stud or handle. In

no shown it is adopted to set into the jaw on the'end of the lathe spinhas vice may held sud ro- 1, r -t may be held in aj'ise or d with, or firmly attached to, 5 shown. Fig. 4-, the plate forming a rim as at s, j in this instance to provide which the wolf" mechanism ..itl..

ted.

ry member of the clamp is es It comprises a pin or screw projects somewhat from the front .1 me and is suiiicientlv' bi h to an a" utroent against which a propmpeeification of Letters letent.

Fatented Apr. 356, twi

in it, leaving spokes 0' which radiate from the hub to the rim. The number of these openings is immaterial, but the stationary member 0 of the clamp is located. to engage one of the spokes, While the other may be engaged by what 1'. have termed clamping member D. The movable or clamping member D is so located asto engage another oi the spokes so as to clamp the gear against the stationary member cos below described. In Fig. 1 this clamping member D is pivoted on the rear face of the plate as at d and comprises a lever having a lip shownat al which projects outward through an opening (Z in the plate. The rear end of the lever d has attached to it a spring the other end of which spring is attached to a pin (Z in the plate. (5 is a thumb piece projecting outwardly from the lever so that the lever may be conveniently operated.

To use this form of chuck the gear is placed upon the centering pin 0 in such a manner that the stationary member owiil project through one of the openings 0 while the clamping member will project through another of the openings 0 In order, however, that the clamping member 1) maypass through this opening 0 it is necessary to move it against the stress of the spring (Z so that it will register with one of the open in -s c and then release it so that it will rotate the gear slightly about its axis 0 and ause it to engage the pin Thus the gear will he clamped. between the stationary member a and the lip d of the clamping member D.

In Figs. i, and 6 another form of my invention is shown in which the spring d7 encircling the stud A engages stationary pin cl at one end and at its other end another stationary "pin d mounted. on a slide D which is slotted and is held against the rear of the plate 13 by means of suitable rivets or screws 6Z passing through the lots. The thumb piece a? in this case com:- prises a pin which projects through a slot 03 in the slide D and serves as the clamping member. It is made in two parts; one part (5 screwsinto the thumb piece proper a e Safe.

(5 so that it binds the thumb pieceagainst the slide. This enables the position oi the thumb piece to be adjusted in. the slot toward and from the periphery of the plate and hence makes the device adjustable for gears of different sizes. The plate B itself in this case has an opening 6 of suiiicient to allow for any ordinary adjustment and movement ot the projecting'end of the thumb piece. As before, a is the stationary member, v1. 0., a pin or screw projecting oat; Ward from the face of the plate, the gear pr Work (1 having, as before, a central opening fitting over the screw which is concentric with the plate. will be noted from 5 that the slide l) moves at an angle to th radius of the plate so that when, after be ing retracted a gainst the force ofpthe spring d, the gear C being in place, it 1s released, it Will engage a spoke c in the gear and force the gear around its axis 0 so that an other spoke 0 will engage the stationary member 0.

It Will be seen that these two forms or my invention are alike in that in each case a spring clamping; member clamps spoke of the gear against a stationary member or pin 0.

In Figs. 7 and 8 another form of my invention is shown in which there are two pins 0 in addition to the stationary memher a, which are of such shape and so placed to engage the teeth on the periphery of the gear 0, a few only of the teeth being shown. In this case, as before, the gear has a central opening which fits over the member 0 Preferably on the sideof the plate 1%, opposite the pins is a slidepiece D similar to the slide-piece D in Fig. 4, and is normally drawn toward the center of the stud A by means of a spring This slide is slotted and through these slots pass guide pins (Z these pin allowing the slide-piece to have a movement parallel with the radius of the plate. In this case the slide-piece is provided With two pins which pass through openings (Z in the plate and project sultaciently far theretl irough to lie between two of the gear teeth on the periphery or the gear.

In order to remove the gear quickly from the plate prefer to provide a spring atte bed at one end to the rear of'the plate he other end a pin 6 which passes hroug'h the plate, the end of: the pin beingflush with By patties" the pin through the plate it will push the clinch and when released Will return its normal position.

lther to those skilled in the art, its essentials comprising plate having a stationary member With which a portion of? the gear may be caused to engage by a clamping" member which shall be movable in order to allow the gear to be clamped.

"What ll claim as my invention is l. The chuck above described, comprising a plate, means for holding; said plate, said plate having stationary member projecting at right angles from the face thereof, a spring-controlled slide adapted to cohpen ate with said stationary member and a centering; pin. located between said stationary member and said slide whereby the Work will be centered. by said centering pin. and will be clamped by slide against said stationary member.

2. The chuck above described, comprising a plate, means for holding said plate, said plate having a stationary member project-- ing from one side thereof, a slide member located on the opposite side thereof, said plate having an opening therein, and said slide having a clamping meansprrijecting through said opening and adapted to clamp the Work against said stationary member.

3 The chuck above described, comprising a plate having a centering pin, means for holding said plate, said plate having a sta tionar member projecting from one side thereof, a slide member located on the opposite side thereof, said plate having an opening therein, and said slide having a clamping means projecting through said opening and adaptedto clamp the Work against said stationary member, said centering pin b lng adapted to serve \as an axis around which the Work may be adjusted by the clamping means to engage the stationary member.

CHRISTIAN cl. LETZING.

forms of: my invention will occur 

